Learn what "it wasn't supposed to happen" means, when people say it, and how to use it naturally in English.

It means the speaker is saying the event was accidental or unintended.
From On One Condition, Episode 44
Someone is admitting that an event was not meant to happen.
Use this to explain that something happened by mistake or against expectations. It can sound like an excuse if the other person is angry.
Scenes unlock real expressions as you watch
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